diff --git a/.changeset/rich-pumas-add.md b/.changeset/rich-pumas-add.md
new file mode 100644
index 00000000..51b85485
--- /dev/null
+++ b/.changeset/rich-pumas-add.md
@@ -0,0 +1,6 @@
+---
+"eslint-mdx": patch
+"eslint-plugin-mdx": patch
+---
+
+chore: add `module-sync` entry
diff --git a/packages/eslint-mdx/package.json b/packages/eslint-mdx/package.json
index 889a249f..ae062369 100644
--- a/packages/eslint-mdx/package.json
+++ b/packages/eslint-mdx/package.json
@@ -22,6 +22,10 @@
         "types": "./lib/index.d.ts",
         "default": "./lib/index.js"
       },
+      "module-sync": {
+        "types": "./lib/index.d.ts",
+        "default": "./lib/index.js"
+      },
       "require": {
         "types": "./index.d.cts",
         "default": "./lib/index.cjs"
diff --git a/packages/eslint-plugin-mdx/package.json b/packages/eslint-plugin-mdx/package.json
index 97d0f921..95cc137a 100644
--- a/packages/eslint-plugin-mdx/package.json
+++ b/packages/eslint-plugin-mdx/package.json
@@ -22,6 +22,10 @@
         "types": "./lib/index.d.ts",
         "default": "./lib/index.js"
       },
+      "module-sync": {
+        "types": "./lib/index.d.ts",
+        "default": "./lib/index.js"
+      },
       "require": {
         "types": "./index.d.cts",
         "default": "./lib/index.cjs"